Area and Circumference

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

What is the diameter?

• 8
• 16
• 10
• 4

What is the radius?

• 18
• 72
• 38
• 14

Find the radius of a circle who's diameter is 40 ft.

• 40ft
• 80ft
• 20ft
• 45ft

The distance halfway across the circle is called the...

• radius

• diameter

• circumference

• area

What is circumference?

• The distance around a circle.
• The space inside the circle.
• A line from side to side passing through the center.
• A line from the center to the side.

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

• c = 15π
• c = 2π15
• c = π(15²)
• c = π(7.5²)

A Circle has a diameter of 18 meters. What is the circumference of the circle? (Best Choice)

• 9π or about 28.26 m

• 18π or about 56.52 m

• 81π or about 254.34m

• 324π or about 1017.36 m

Find the circumference of the circle

• 21.98
• 153.86
• 43.96
• 615.44